Therefore, when replacing an engine, an inspection of the catalytic converters and ALL transferred components
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1 Engine Failure and Close-Coupled Cat Converter Information For GM Vehicles While GM vehicles using closecoupled catalytic converters may provide improved vehicle emissions at cold ambient temperatures, they present a possible concern if engine failure occurs. Certain General Motors products may be equipped with a new style of catalytic converter, technically known as the closecoupled catalytic converter (Figure 1, below), providing quick catalyst warm-up resulting in lower tail pipe emissions earlier in the vehicle operating cycle. If an engine breakdown or nonfunction were to occur (such as broken intake/exhaust valve or piston), debris may be deposited in the converter through the engine exhaust ports. If the engine is non-functioning due to severe overheating, damage to the ceramic brick internal to the catalytic converter may occur. This may result in ceramic debris being drawn into the engine through the cylinder head exhaust ports. If a replacement engine is installed in either of these instances, the replacement engine may fail due to the debris being introduced into the combustion chambers when started. Therefore, when replacing an engine, an inspection of the catalytic converters and ALL transferred components (such as exhaust/intake manifolds) should be performed. Any debris found should be removed. In cases of engine failure due to severe overheating, installers should also inspect each catalytic converter for signs of melting or cracking of the ceramic brick. If damage is found, the converter should be replaced. Engine Misfire on GM 1.6L Engines Some customers may comment on an intermitent engine misfire on GM vehicles using the Eco-Tec II 1.6L four cylinder engine (VIN 6 - RPO L91) found in Chevrolet Aveo and Pontiac Wave (Canada Only). Typically, misfires related to this valve sealing concern will be very intermittent and may or may not be felt by the driver. They will normally occur during engine warm up, deceleration, highway driving, wide open throttle acceleration, and/or uphill driving The engine misfire may be experienced due to a valve sealing condition. If this concern has been noticed and it has been ongoing, a previous GM repair involving replacement of only intake valves and seals may have been performed. The current recommended repair is to replace all valves and seals with the part numbers shown in the table below if they have not been replaced previously by GM. Part Number Description Intake Valve Exhaust Valve Valve Stem Oil Seal Oil Leak at Front of Engine on GM 1.6L VIN 6 Engines An oil leak at the front of the engine on GM 1.6L VIN 6 engines may be troubling to customers, especially if the oil is leaking out of the oil pump area. The oil pump-to-engine block gasket may leak near the top of the oil pump assembly, resulting in a leak that spreads oil on the front of the engine and oil pump.technicians may misdiagnose the source of the leak and unnecessarily replace the oil pump along with the gasket if they are unable to determine the exact location of the oil leak. The oil pump gasket may develop a crack that cannot withstand high oil pressure under operating conditions. GM has developed a new metal-reinforced oil pump gasket (p/n ) that should be used anytime the oil pump is removed (Figure 2, page 8). RTV sealant should not be used when installing a new gasket. Figure 1 Close-coupled catalytic converters on GM vehicles may become damaged after certain engine failures. Cylinder Head Replacement For GM 3.4L VIN E Engines Any time you are replacing a cylinder head on GM 3.4L VIN E engines the following information should be reviewed. To date, there have been two different rocker mounting bolts used to secure the non adjustable rockers to the cylinder head.while the cylinder heads are otherwise interchangeable, the rocker arms and bolts may not be. 6 AERA TECH SOLUTIONS GUIDE February 2008
2 Head Casting Number Bolt Design Rocker Arm Part Number , , mm , mm Figure 2 GM has developed a new metal reinforced oil pump gasket for L engines. There is at least one cylinder head casting number that has been manufactured with both 8mm and 10mm rocker bolt holes. Above is a list of casting numbers with bolt design used and appropriate rocker arm part numbers to assist in identifying which head is required. Oil Leak at Rear of Crankshaft on GM 4.2L VIN S Engines This leak from the rear of crankshaft is due to porosity problems in the crankshaft. GM offers the following solution to the problem. Verify the leak by looking at the end of the crankshaft. If oil is present in the bore (where the torque converter nose engages the crankshaft), a special service procedure should be performed. If the bore is dry, or oil appears to be from the seal area, perform normal oil leak analysis. A service cup plug has been developed to stop leakage that may occur in this area and can be ordered under p/n WPC- 340 only through the Warranty Parts Center. Clean the crankshaft flange bore area with brake clean or equivalent. Thoroughly dry the area and examine the bore surface for irregularities. If the bore surface needs additional cleaning, use sand paper or equivalent and clean as necessary. Once the crankshaft bore is clean and smooth, apply a thin bead of Loctitite 620 (TM) completely around the inside of the crankshaft flange bore. General Motors offers a tool to aid the installation.if the tool is not available through local dealership, an aftermarket equivalent is acceptable. Position the crankshaft service cup plug into the crankshaft flange bore with the service cup plug, dish side outward (Figure 3, page 9). Note: Do not use an impact socket with hammer to drive the service cup plug into place. Damage to the crankshaft thrust bearing may result. Assemble arbor, forcing screw, attaching bolts and socket. Install the tool press assembly to the end of the crankshaft flange and position the socket and service cup plug into the bore of the crankshaft flange. Be sure you have the proper tool set up Circle 208 for more information 8 AERA TECH SOLUTIONS GUIDE February 2008
3 Figure 3 Install service cup plug dish side out on GM 4.2L crankshafts. Do not drive plug in place with impact socket and hammer as damage may result. before pressing the cup plug into the end of the crankshaft. The forcing screw will fit inside an 18 mm or 19 mm end of the impact style socket with the 1/2 drive side of the socket facing the service cup plug.the forcing screw should bottom on the 15 mm step inside the socket. Hand tighten forcing screw into the socket, making sure that it is centered on the service cup plug. Mark forcing screw and arbor for reference, then tighten forcing screw two complete turns and an additional 90 degrees or 1/4 turn more. When completed, remove installation tool assembly and confirm the installation depth of the service cup plug. Place a straight edge across the center of the crankshaft flange as the measurement point. Measure from the straight edge to the center of the installed cup plug. The depth of the installed cup plug should be mm ( ). Figure 4 A possible coolant leak may occur between the cylinder head valve guide bore and the interior of the cylinder head casting on GM 4.8 and 5.3L engines. Coolant in the Engine Oil on GM 4.8 and 5.3L Engines Some GM 4.8 and 5.3L VIN V,T, B and M engines may experience a coolant leak into the engine oil. Two different locations may be responsible and should be investigated when coolant loss is noted and cylinder head service is appropriate. A possible coolant leak may exist between the cylinder head valve guide bore and the interior of the cylinder head casting, or a porosity condition may exist on certain Castech castings (as shown if Figure 4, right). Under pressure while the cylinder head casting is hot, coolant may collect in the leaking areas of affected heads and if allowed to continue, eventual oil and coolant mixing will occur, resulting in engine damage. To determine if a cylinder head is Circle 209 for more information ENGINE BUILDER 9
4 Figure 5 A porosity condition may exist on certain Castech castings. Above arrow shows Castech logo found on some GM 4.8 and 5.3L engines. manufactured by Castech, inspect the inside corners for a logo such as the one shown in Figure 5, left. DTC P0300 & Engine Misfire On 2000 GM 4.3, 5.0 & 5.7L VIN W, M, R Engines An engine misfire on 2000 GM 4.3, 5.0 and 5.7L VIN W, M and R engines may be encounted and a P0300 diagnostic trouble code may be set on certain situations when the vehicle is under extreme load, such as cruising uphill, pulling a trailer or on hard acceleration. If the P0300 diagnostics did not isolate a concern, to resolve the trouble code, the following may help: Remove the valve cover, valve springs and valve seals on the affected cylinder(s). A small wire tie or rubber bands can be placed in the valve stem keeper groove to prevent the valve from falling into the cylinder. Rotate the valve while moving it up and down in the guide to see if it binds. If a binding valve is found, remove both cylinder heads and increase the valve stem-to-guide clearance. In these instances, it is recommended to provide a minimum valve stem-to-guide clearance of.0020 (.051 mm) for all guides. Even though the service manual specification for valve stem clearance is listed as ( mm), the clearance must be increased. In certain driving situations, when combustion temperatures are at their maximum, the minimum listed specification may be insufficient. One method of increasing the clearance is to hone the guide with a 9 mm hone, until a clearance of.002 is obtained. Doing so will usually only take about 4 strokes of the hone. Exhaust Manifold Bolt & Torque Update For GEN III 4.8, 5.3, 5.7, 6.0L Engines A new exhaust manifold bolt and torque specification was introduced to GEN III Vortec small block V8 engines beginning in the 2004 model year to update the GEN III 4.8, 5.3, 5.7 and 6.0L engines.when servicing any of the GEN III small block exhaust manifolds, the exhaust manifold bolts should be replaced. These exhaust manifold Circle 210 for more information 10 AERA TECH SOLUTIONS GUIDE February 2008
5 bolts can be purchased from GM (p/n ).When installing the bolts into the mounting hole, apply a.200 (5 mm) wide bead of high temperature thread locker (GM p/n [US] and p/n [Canada] or equivalent) to the threads of the exhaust manifold bolts before installation. Tightening the exhaust manifold bolts should be done in two passes. First, tighten the two center bolts on the exhaust manifold. Then, tighten the rest of the bolts alternating from side-to-side while working toward the outside bolts. During the first pass of bolt tightening, tighten bolts to 59 in.lbs. Then, on the final bolt torque pass, tighten the bolts to 15 ft.lbs. Revised Connecting Rod Bolt Torque For GM 4.8, 5.3, 5.7 and 6.0L Engines This information regarding revised connecting rod bolt torque for GM 4.8, 5.3, 5.7 and 6.0L engines applies to all current GEN III and IV design small block engine variations. This information should be considered any time the bolts are being installed. Additional final torque may be applied to the connecting rod bolts in the above mentioned engines. Although the bolt tightening method uses the now familiar torque-turn, the bolts do not require replacement unless damaged. The bolts should be tightened in a two step process, with the second step including an additional 10 turn from the original specification. 1 Figure 6 An oil leak on GM 4.8, 5.3, 5.7, 6.0 and 7.0L engines may suggest that the leak seems to be coming from the rear cover gasket area. Circle 211 for more information ENGINE BUILDER 11
6 Application 1st Step 2nd Step GEN II & GEN IV 15 ft.lbs. (20 Nm) Rotate Each Bolt an additional 85 using a Torque Angle Meter (J45059) Rear Engine Oil Leak on GM 4.8, 5.3, 5.7, 6.0 and 7.0L Engines While an initial investigation of a rear engine oil leak on GM 4.8, 5.3, 5.7, 6.0 and 7.0L may suggest that the leak seems to be coming from the rear cover gasket area, this condition may actually be caused by engine block porosity on the engine block sealing surface. If the leak is found to be coming from the rear cover gasket area (see Figure 6, page 11), remove the cover and inspect the cylinder block for any indications of porosity in the sealing areas. If porosity is found anywhere on the sealing surface, use RTV p/n to fill in any porosity locations. Wipe a small amount of the RTV sealant onto the surface using a plastic scraper to fill in the porosity holes on the mating surface of the cylinder block. Remove any excessive RTV that may have been applied, especially from the high-pressure oil passage as shown with arrow in picture below. Allow the RTV to cure 10 minutes before installing the rear cover.when installing the rear cover, tighten the engine rear cover bolts to 18 ft.lbs. Recommended Spark Plug For 2003 GM 5.3 & 6.0L VIN T & U Engines The following information regarding the correct spark plug for 2003 GM 5.3 and 6.0L VIN T and U engines is being provided in conjunction with a voluntary recall from General Motors. Certain 2003 Chevrolet Silverado and Express trucks as well as GMC Sierra and Savanna model vehicles equipped with a 5.3L (RPO LM7 - VIN T) or 6.0L (RPO LQ4 - VIN T) engines may have been built with wrong spark plugs. The incorrect spark plugs could lead to idle degradation or engine piston damage under high load and/or high temperature operation, such as trailer towing. Vehicles involved are shown in Chart 1, page 13, and they should have their spark plugs replaced with p/n , if they have not already been replaced. If a GM dealer has already made this repair there should be a label attached to the radiator core support. It remains unclear if all aftermarket parts catalogs reflect the correct spark plug part number for the GM (p/n or AC Delco ). Head Bolt Replacement For GM 7.4L VIN B, D, J & S Engines GM and AERA now recommend replacing the head bolts after one usage on GM 7.4L VIN B, D, J & S engines. Doing so provides a Circle 212 for more information 12 AERA TECH SOLUTIONS GUIDE February 2008
7 better likelihood the following installation process will provide a longer lasting gasket seal. Make sure the threaded holes in the engine block are clean and not damaged. Do not use sealer on any engines that use a composition type gasket. Align the cylinder head gasket locating mark to face up. 1) Place the cylinder head gasket in position over the cylinder head locating pins and guide the cylinder head carefully into place over the locating pins and the cylinder head gasket. 2) Always use NEW cylinder head bolts when servicing the cylinder head. Do not reuse the cylinder head bolts, because the bolts may stretch or break causing engine damage. If not preapplied to the new cylinder head bolts, apply sealer GM P/N or equivalent to the cylinder head bolts. Refer to Use of RTV and Anaerobic Sealer.The sealer must be applied to a minimum of eight threads starting at the point of the cylinder head bolt. Install all 16 bolts finger tight. 3) Tighten all of the cylinder head bolts in the sequence shown in Figure 7, above, to 37 ft. lbs (50 Nm). 4) Rotate bolts numbered 1, 2, 3, 6, 7, 8, 9, 12, 14 and 15 in sequence an Chart 1 These vehicles have the incorrect spark plugs and should be replaced. additional 150 turn. 5) Rotate bolts numbered 13 and Figure 7 Cylinder head bolt torque sequence for GM 7.4L engines. 16 in sequence an additional 150 turn. 6) Rotate bolts numbered 4, 5, 10 and 11 in sequence an additional 150 turn. After the cylinder head is secured to the cylinder block, install and: Tighten the spark plugs in a new cylinder head to 22 ft.lbs. (30 Nm). Tighten the spark plugs in serviced cylinder heads to 15 ft.lbs. (20 Nm). TSG Circle 213 for more information ENGINE BUILDER 13
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